Date.TotalSeconds Epoch for Windows and Linux

General
1

Since the Epoch for Mac OS is 12:00AM, January 1, 1904, and THAT is based on some mystical date chosen by Steve Jobs. What do we need to use for Windows and Linux as the Epoch so that I know the difference between the Xojo definition of TotalSeconds and the Linux or Windows version?

I know that we need to add 2082819600 to the TotalSeconds in Mac OS to get something that agrees with the Unix Epoch, but what about Linux and Windows since there’s a difference in the way the Epoch is handled.

2

Actually nothing mystical about it at all… 1904 was the first leap year of the 20th century.
Windows and Linux use Jan 1st 1970 if I recall

3

of course you can test this in about 3 lines of code on each target

dim d as new date
d.totalseconds = 0
break

Windows & Linux use the same Mac Epoch

Or read the documentation where its stated
http://documentation.xojo.com/index.php/Date

4

Then something else is going on because I get three different date conversions for the same totalseconds value.

@Dave S - I did some deep digging in the general realm and it’s actually 1904 for Mac OS, 1970 for Unix, and 1601 for Windows.

5

Same set up for the gmtoffsets etc ?

That would affect results if not

6

This wiki explains date/time differences in different systems and programming languages:
https://en.wikipedia.org/wiki/System_time